A device for projecting sound waves, as in a loudspeaker. 角状扩音器一种用来产生声波的装置，如扬声器
A partition that prevents interference between sound waves in a loudspeaker. 隔音板在扩音器中防止声波相互干扰的隔离装置
A thin disk, especially in a microphone or telephone receiver, that vibrates in response to sound waves to produce electric signals, or that vibrates in response to electric signals to produce sound waves. 膜片，振动板一种薄的圆盘(尤其是在麦克风和电话收话器里那种)响应声波振动产生信号或者响应电信号振动产生声波
Sound waves are measured by their amplitude. 声波是根据其振幅来测量的。
